I will point out that it generally takes more effort to make one sandwich, than it takes to make one sandwich out of a hundred. Getting fresh bread and (fresh?) spiced mayo is extra work that you only need to do once per multiple sandwiches, but it doesn’t really get easier when only making one.

All I’m saying is, enjoy things made by specialized professionals, economies of scale mean that it’s more efficient for one person to make sandwiches for their surroundings anyways!